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EL509S is a modified version of the original EL509/EL519. Does not have a top plate-cap and has an 8-pin octal base. Can handle 700V and 42W plate dissipation. Popular in OTL applications. Please note that this is an 8 pin tube that has no plate cap. It is not interchangeable with NOS EL509s.

The JJ EL-844 is a new version of the EL84 tube. It has Reduced power and a more balanced frequency response. Spiral Filament. It reduces headroom by approximately 25%, which allows it to achieve overdrive at lower volume levels. The JJ EL844 has a maximum dissipation of 9 watts, as opposed to 12 watts of a standard EL84. The plate is physically smaller than the standard EL84. When using the JJ EL844 in and amplifier with fixed bias, bias should be set accordingly so the tubes at idle are between 50 - 70% of maximum dissipation. When using the JJ EL844 in an amplifier with cathode bias, the bias resistor may need to be changed to keep the tubes from exceeding their 9 watt maximum dissipation.

Octal power tube (Max Plate Watts = 25W). This Slovakian tube is tight and punchy with a more straightforward mid body than its 6L6GC cousin. The highs are also more subtle than those of the 6L6GC. In overdrive, it is tight and hard driving with glassy highs.

Octal power tube (Max Plate Watts = 25W) KT77 is a beam power pentode with octal base. It can be used in most EL34 amplifiers. It has more power, fatter bass and more headroom than the EL34 and E34L while providing very detailed tones.